Friction shock absorbing mechanism for railway cars



April 15, 1952 PETERSON 2,592,731

FRICTION SHOdK ABSORBING MECHANISM FOR RAILWAY CARS Filed April 38, 1950 Patented Apr. 15, 1952 FRICTION SHOCK ABSOBBING MECHANISM FOR RAILWAY cans Arnold G.Peterson, Chicago, 111., asslgnor to W. H.

Miner, Inc., Chicago, 111., a corporation of Delaware Application April 28, 1950, Serial No. 158,656

2 Claims. 1

This invention relates to improvements in friction shock absorbing mechanisms especially adaptedfor use in connection with draft rigglngs of railway ca'rs.

One object of the invention is to provide a friction shock absorbing mechanism of the character indicated, having high capacity, and comprising van outer friction casing, friction shoes slidingly telescoped within said casing, a pressure transmitting wedge block in wedging enagement with the shoes, a second casing within the outer casing, friction shoes slidable within said second casing, a wedge in wedging engagement with said second named shoes and bearing on the inner ends of the first named shoes, a springwithin the second named casing yieldingly opposing inward movement of the second named shoes, and a main spring within the first named casing, surrounding said second named casing, and yieldingly opposing inward movement of said first named shoes.

Other objects of the invention will more clearly appear from the description and claims hereinafter following.

In the accompanying drawing forming a part of this specification, Figure 1 is a front, elevational view of my improved friction shock absorbing mechanism. Figure 2 is a longitudinal sectional view, corresponding substantially to the line 2-2 of Figure 1. Figure 3 is a transverse, vertical sectional view, corresponding substantially to the line 3-4 of Figure 2. Figure 4 is an end elevational view of the wedge member of the inner friction shock absorbing mechanism, looking from left to right in Figure 2.

As shown in the drawing, my improved friction shockabsorbing mechanism comprises broadly a main friction casing A, a set of three friction shoes .B-H-B slidingly telescoped within the casing A, a wedge block C in wedging engagement with the shoes BB-B, a second or inner friction casing D, a second set of three friction shoes E-E -E in sliding frictional engagement with the casing D, a second wedge block F abutting the inner ends of the shoes BB-B and having wedging engagement with the shoes E-E-E, a spring G within the casing D, yieldingly opposing inward movement of the shoes E-EE, and a adapted to cooperate with the usual rear stops of the draft rigging of a railway car. The casing surfaces A is of hexagonal, transverse cross section, and

has three inwardly converging, interior friction H-l lll of V-shaped. transverse cross section at its open end. i

The friction shoes B arethree in number and are slidingly telescoped within the casing A, each jshoe having a V-shaped friction surface I! on its outer side slidingly cngagedwith one of the friction surfaces l I of the casing A. On the inner side, each shoe has a wedge face I! of V-shaped, .transverse cross section.

The wedge faces l'3--l3l3 of the three shoes converge inwardly of the casing A. At its rear end, each shoe B presents a flat, transverse abutment face H for the spring H. The face of each shoe is reces sed at its inner side to provide a flat, transverse seat IS on which the wedge block arrangedto bear. .l

The wedge block C has three inwardly convergingwedge faces. l6--I6-l6 at its inner end casing A and has its rear end, which is closed by a transverse wall I 9, bearing on the inner side of the wall H) of the casing A. The casing D is also of hexagonal, transverse cross section and has three inwardly converging, interior friction surfaces 20-2 0-40 at its front end, which are of V-shaped, transverse cross section. The

' casing D is held centered by an inwardly projecting lug 2| on the wall [0 of the casing A, engaged in an opening 22 in the wall I! of said casing D.

The friction shoes E are slidingly telescoped within the casing D, each shoe having a friction surface 23 on its outer side slidingly engaged with main spring H within the casing A yieldingly 1 opposing inward movement of the shoes 3-3-3. The casing A is in the form of a tubular member open at its front or left hand end, as seen in Figure 2;and closed at its rear end by a transone of the friction surfaces 20 of the casing D.

. On its inner side, each shoe E has a wedge face 324 of v-shaped, transverse cross section. The

wedge faces 24-44-24 of the three shoes verse-wall '|0, which is extended outwardly of the casing at opposite sides, as shown in the drawing, to' provide a follower member, which is E-E-E converge rearwardly or inwardly of the Leasing D.

The wedge block F is engaged between the shoes E--E--E and has three inwardly converging wedge faces 25-25-25 of V-shaped, transverse cross section engaged, respectively, with the wedge faces 242424 of the three shoes EEE. At its front or left hand end, as viewed in Figure 2, the wedge block F has an annular flange AG bearing on'the seats l5-l5l5; of the shoes v I The spring G is in the form of a helical coil disposed within the casing D and bears at its front and rear ends, respctively on the inner ends of the shoes EEE and the wall 19 said casing.

casing; a wedge pressure transmitting member in wedging engagement with said shoes; and means yieldingly opposing inward movement of said shoes including a spring and a friction unit, said friction unit including a second friction casing within the firstnamed casing, friction shoes slidingly telescoped Withi'r'rsaid second named casing, a spring within said second named casing yieldingly opposing inward movement of saidsecond named shoes, said first named spring surrounding said second named casing, and said second named spring and friction unit being The main spring H is also: in theform off a.-.

helical coil and is heavier than the spring G..:.'

The spring H surrounds the casing D and has its front and rear ends bearing, respectively on the and the wall ll! of the casing A. l

The operation of my improved friction shock absorber-is as follows: vUpon inward movement of the wedge C,-during compression of the-mechanis m the shoes-'B-B-B are w edged apart and forced to slide inwardly onthe; friction surfaces ofrthecasingA; resisted by'thespringH. During this inward movement of, the wedge C, the shoes Ba-eB- B'force' the wedge block F rearwardly or .inwardly'of the casing D, spreading the shoes E'E-E apart andzsliding them inwardly. on

:the frictionsurfa'ces 2B--2U2B of the casing D,

. Nuniben interposed between the closed rear end. of said first'named' casing' and said first named shoes.

2. In a friction shock absorbing mechanism,

the combinationwith a friction casing; of friction shoes 'slidirigly telescoped within the casing;

a' wedge pressure transmitting member in Wedging engagement with said shoes; and means yieldingly opposing movement of said shoes inwardly of the casing, including a second friction casing,

friction shoes slidable within said second named casing, a wedge m wedging engagementwith said second named shoes and bearingron the-inner ends of said first namedshoes, ,a-spring within said second named gcasing ,yieldingly. opposing movement of said second named shoes-inwardly \ofsaid second named casing, and a'spring within said first named casing surrounding ,said second named casing;a11d bearing on the-inner-endslof said first named shoes, i

- ARNOLDHG'PPETERS'ON. REFERENCES CITED i I The following referencesa're of record n 'th'e file of this patent: I

" NITED sTATns PriTENTs H 

